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Restructuring and Other Items, net (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Restructuring, settlement and impairment provisions [Abstract] |  |  |
Annualized savings from reduction of workforce |  | $ 6.0 |
Restructuring Charges [Abstract] |  |  |
Impairment of assets charges | $ 0.7 | 5.3 | $ 18.5
Severance and other employee costs | 1.8 | 10.8 | 12.7
Total restructuring and other items, net | 2.5 | 15.0 | 28.3
Restructuring Reserve [Roll Forward] |  |  |
Restructuring liability, beginning of period | 8.1 |  |
Additional provisions | 1.7 |  |
Cash payments | (6.6) |  |
Other | (0.7) |  |
Restructuring liability, ending of period | 2.5 | 8.1 |
Specialty Minerals [Member] |  |  |
Restructuring Charges [Abstract] |  |  |
Impairment of assets charges | 0.7 | 5.3 | 0.0
Severance and other employee costs | 0.0 | 5.0 | 0.0
Refractories [Member] |  |  |
Restructuring, settlement and impairment provisions [Abstract] |  |  |
Gain on previously impaired assets |  |  | 2.9
Restructuring Charges [Abstract] |  |  |
Other | 0.0 | 0.0 | (2.0)
Energy Services [Member] |  |  |
Restructuring Charges [Abstract] |  |  |
Impairment of assets charges | 0.0 | 0.0 | 18.5
Severance and other employee costs | 1.8 | 1.7 | 12.7
Other | 0.0 | (1.1) | (0.9)
Corporate [Member] |  |  |
Restructuring Charges [Abstract] |  |  |
Impairment of assets charges | 0.0 | 0.0 | 0.0
Severance and other employee costs | $ 0.0 | $ 4.1 | $ 0.0

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